Mention that CoreOS is supported, and also uncomment ZFS support because unofficial-flocker-tools#2 landed.
Mention that CoreOS is supported, and also uncomment ZFS support because unofficial-flocker-tools#2 landed.

hackday-profilers/flocker,agonzalezro/flocker,mbrukman/flocker,w4ngyi/flocker,agonzalezro/flocker,wallnerryan/flocker-profiles,hackday-profilers/flocker,mbrukman/flocker,w4ngyi/flocker,AndyHuu/flocker,w4ngyi/flocker,hackday-profilers/flocker,agonzalezro/flocker,AndyHuu/flocker,AndyHuu/flocker,wallnerryan/flocker-profiles,mbrukman/flocker,wallnerryan/flocker-profiles